FILTERING AND ABSORBING CANISTER FOR GAS MASK Russian patent published in 2006 - IPC A62B23/02 

FIELD: protective devices to protect respiratory organs against air-borne hazardous substances.

SUBSTANCE: canister comprises cylindrical body with bottom and neck, aerosol filter, dust filter and sorbent layer. The canister also has outer and inner vertical cylindrical nets having diameters of 0.85-0.95 and 0.05-0.2 of body diameter correspondingly. Sorbent block is secured between the nets by varnish or mastic. The sorbent block has height of up to 10 mm and is divided into at least 8 segments. Number of segments is preferably more than 8. Side surfaces of even-numbered segments are covered with varnish or mastic to provide air impermeability thereof. Box bottom comprises double walls for aerosol filter fastening. The aerosol filter is connected to sorbent and outlet orifices of the second wall are created to provide air supply in upper box part by-passing the sorbent. Insert to provide air supply to even-numbered segments in counterflow is installed in front of neck. After air flow passing through even-numbered segments air is supplied to odd-numbered segments having concave, wavy or serrated surfaces to convey air to outlet through neck.

EFFECT: improved performance along with retaining protective properties.

3 dwg